#all{
    width: 500px;
    height: 300px;
    background-color: antiquewhite;
    margin: 0 auto;
    padding: 5px 5px 10px 5px;
}
#top{
    position: relative;
    height: 50px;
    background-color:rgb(235,235,235);
}
#top ul{
    position: absolute;
    top: 10px;
    left: 5px;
}
#top li{
    width: 120px;
    height: 40px;
    background-color:rgb(231,231,231);
    float: left;
    text-align: center;
    margin-left: 10px;
    border-radius: 5px 5px 0 0 ;
}
#top li a{
    width: 100%;
    height: 100%;
    line-height: 40px;
    text-decoration: none;
    color: black;
    font-weight: 600;
    font-family: "黑体";
}

#top img{
    height: 50px;
    float: right;
}
#mid{
    position: relative;
    height: 150px;
    background-color: #ccc;
}
#content1{
    position: absolute;
    width: 100%;
    height: 115px;
    background-color: brown;
}
#content2{
    position: absolute;
    width: 100%;
    height: 115px;
    background-color:red;
}
#midbottom{
    width: 100%;
    height: 35px;
    position: absolute;
    bottom: 0;
    background-color: chocolate;
}

#bottom{
    height: 100px;
    background-color: blueviolet;
}
.xian{
    position: absolute;
    width: 100%;
    height: 115px;
    background-color: brown;
}
